I use anywhere from 7:2 to 7:3, although I have not been using it very long.
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You are trying to be too accurate. That's like measuring out the exact amount of sugar to put in your coffee.
Thinning paint isn't science and it doesn't have to be that
acurate. Read
This
Page on my web site. If you try to be that accurate you
are going to spend more time thinning paint than painting and are
always going to be frustrated. As the paint thickens in the
bottle over time the thinning ratio is going to change. As the
temperature changes the paint will thicken or thin and the thinning
ratio is going to change. Paint viscosity will change from
manufacturer to manufacturer, from
color to color, even from bottle to bottle and this will affect the
thinning ratio. Many things affect the thinning ratio and it
isn't a critical number.
Pick a pressure you want to spray at. Thin the paint to about
3:1. If it doesn't want to spray properly add a little more
thinner or a little more pressure. If it sprays thin and watery
add a little more paint or drop the pressure slightly. I start at
10 psi and 3:1. If things don't work I adjust from there.